SDL/SDL_mixer problems with Xcode

I've searched and searched and searched for an answer to this problem, and have been unable to find anything.

I'm creating a 3D game using a 3D engine that uses OpenGL. I decided to add sound to my game by using SDL_mixer.

So, I fiddled around and managed to get the main SDL lib to work. I have SDLmain.m with #import <SDL/SDL.h> in it. I also have the SDL.framework and SDL_mixer.framework added to the project.

However, when I go to compile my source files (the header includes "SDL/SDL.h" and "SDL_mixer/SDL_mixer.h"), I get the following:

Code:

/Library/Frameworks/SDL_mixer.framework/Headers/SDL_mixer.h:28:23: error: SDL_types.h: No such file or directory
/Library/Frameworks/SDL_mixer.framework/Headers/SDL_mixer.h:29:23: error: SDL_rwops.h: No such file or directory
/Library/Frameworks/SDL_mixer.framework/Headers/SDL_mixer.h:30:23: error: SDL_audio.h: No such file or directory
/Library/Frameworks/SDL_mixer.framework/Headers/SDL_mixer.h:31:27: error: SDL_byteorder.h: No such file or directory
/Library/Frameworks/SDL_mixer.framework/Headers/SDL_mixer.h:32:25: error: SDL_version.h: No such file or directory
/Library/Frameworks/SDL_mixer.framework/Headers/SDL_mixer.h:33:24: error: begin_code.h: No such file or directory
/Library/Frameworks/SDL_mixer.framework/Headers/SDL_mixer.h:580:24: error: close_code.h: No such file or directory